Brazing vs Welding- Difference Between Brazing and Welding

What is brazing ?

Brazing is a joining process, which produces coalescence of materials by heating to a suitable temperature and by using a filler metal (often referred to as braze) having a liquidus temperature above 450 degree C and below the solidus temperature of the base material. The filler metal is drawn into the gap between the closely fitted surfaces of the joint by capillary action. To achieve a perfect joint, the filler and the parent materials should be metallurgically compatible and the design of the joint should incorporate a minimum gap into which the braze filler metal will be drawn. The joints must be properly cleaned and protected by the flux or protective atmosphere during the heating process to prevent excessive oxidation. There are many ways of brazing, and they all differ in the method of applying heat to the braze assembly, in particular, the joint area. These include torch brazing, furnace brazing, induction brazing, dip brazing, and resistance brazing.

What is Welding : 

Welding is the most prominent process for joining large components into complex assemblies or structures. A necessary condition for welding is that the two or more surfaces to be joined must be brought into intimate contact. When fusion takes place, the joint is achieved by melting of two or more workpiece materials in a localized region. In contrast, the solid-state joining processes rely on plastic deformation of the surface asperities along the contact surface representing the original weld interface or the impending weld joint.

The success of a welding process not only depends on the selection of appropriate welding conditions or process parameters, but also on the joint configuration and welding position. The loads applied on a welded structure in the actual application are transferred from one member to another through the weld joints.

Tabular Difference Between Welding ,Soldering and Brazing Tabular Difference Between Welding , and Brazing 
Tabular Difference Between Welding , Brazing

Difference Between Brazing and Welding

BrazingWelding
Brazing are weaker than welding joints but stronger than soldering joints. This can be used to bear the load up to some extent.Welding joints are strongest joints used to bear the load. Strength of the welded portion of joint is usually more than the strength of base metal.
Brazing joints are stronger than soldering but weaker than welding.It forms strongest mechanical joint which can withstand with high working stress.
Less skill require to join metal.High skilled labour required
Temperature required
is 3800 degree Centigrade in Welding joints.
Temperature may go
to 600 degree Centigrade in Brazing joints.
No change in mechanical properties.The properties of base metal may change.
Work pieces are heated but below their melting point.Work piece to be joined need to be heated till their melting point.
Heat treatment is generally required to eliminate undesirable effects of welding.No heat treatment is required after brazing.
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